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P2P Security

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In the BitTorrent P2P file distribution protocol, the seed breaks the file into blocks, and the peers redistribute the blocks to each other. Without any protection, an attacker can easily wreak havoc in a torrent by masquerading as a benevolent peer and sending bogus blocks to a small sub-set of peers in the torrent. These unsuspecting peers then redistribute the bogus blocks to other peers, which in turn redistribute the bogus blocks to even more peers. Thus it is critical for BitTorrent to have a mechanism that allows a peer to verify the integrity of a block, so that it doesn't redistribute the bogus blocks. Assume that when a peer joins a torrent, it initially gets a .torrent file from a fully trusted source. Describe a simple scheme that allows peers to verify the integrity of blocks.

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Solution Summary

This 361 word solution explains how to create a scheme that will allow peers to verify the integrity P2P file blocks.

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Hi,

Please find attached the word document describing the scheme as requested. I hope it will be enough for you to complete your task.

I've included couple of reference as well.

Answer:
A scheme that could be applied to verify the integrity of the blocks of a file, which is being distributed through a number of peers, is described below:
Let's consider, a video file is being distributed by a P2P network. Is this scenario, we can assume that the scheme which can assure the signing of each of the blocks or chunks of the video file can be better protected against the malicious peer which distributes fake blocks. ...

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